<template>
  <div id="app">
    <div class="todo-footer" v-show="total">
      <label>
        <!-- <input type="checkbox" :checked="isAll" @change="checkAlls"/> -->
         <input type="checkbox" v-model="isAll"/>
        
      </label>
      <span> <span>已完成{{doneTotal}}</span> / 全部{{total}} </span>
      <button class="btn btn-danger" @click="clearTodo">清除已完成任务</button>
    </div>
  </div>
</template>
<script>
export default {
  name: "MyFooter",
  props:["todos"],
  computed:{
    total(){
      return this.todos.length
    },
    doneTotal(){
      return this.todos.reduce((pre,todo) => pre + (todo.done ? 1:0),0)
    },
    // isAll(){
    //   return this.doneTotal == this.total && this.total > 0;
    // }
    isAll:{
      get(){
        return this.doneTotal == this.total && this.total > 0;
      },
      set(value){
        // this.checkAll(value)
        this.$emit('checkAll',value)
      }
    }
  },
  methods:{
    // checkAlls(e){
    //   this.checkAll(e.target.checked)
    // }
    //清除
    clearTodo(){
      // console.log("hello")
      // this.clearTodos()
      this.$emit('clearTodos')

    }
  }
};
</script>
<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
